Arene-Perfluoroarene Interactions in Solution.

Area of Science:

• Supramolecular Chemistry
• Organic Chemistry
• Physical Chemistry

Background:

• Arene-perfluoroarene interactions are crucial in various chemical and biological systems.
• Understanding these non-covalent interactions is key to designing functional molecular assemblies.

Purpose of the Study:

• To systematically investigate the factors influencing arene-perfluoroarene interactions in solution.
• To quantify the binding affinities and elucidate the driving forces behind these interactions.

Main Methods:

• Nuclear Magnetic Resonance (NMR) titration experiments were employed to measure binding constants.
• X-ray crystallography provided insights into the structural basis of the interactions.
• Computational analysis was used to model and understand the energetic contributions.

Main Results:

• Fluorination, extended π-systems, and increased solvent polarity substantially stabilize stacking energy.
• Binding affinities (Ka) were enhanced by up to three orders of magnitude, reaching 6000 M⁻¹.
• Optimal binding was observed for water-soluble perfluoronaphthalene and anthracene derivatives in buffered D₂O.

Conclusions:

• The strong binding is attributed to a combination of favorable electrostatic, dispersion, and entropically driven hydrophobic effects.
• This study provides a comprehensive understanding of arene-perfluoroarene interactions in aqueous environments.
• The findings pave the way for utilizing these interactions in biological and medical contexts.